Motor drive control apparatus, motor drive control method and program of the same

Abstract

A general-purpose comparator can be used as a comparison processing module to reduce the costs of a motor drive control apparatus. The apparatus has an electric machine; a magnetic pole position computation processing module; a pattern generation processing module; a switching angle computation processing module which computes a switching angle where switching is done in a next control period based on a pulse pattern; a comparison processing module which compares the magnetic pole position with the computed switching angle to generate a comparison signal; and an on-off output processing module which generates a PWM signal based on the comparison signal indicative of the comparison result. In this case, because the magnetic pole position is compared with the computed switching angle to generate the PWM signal based on the comparison signal, a general-purpose comparator can be used as the comparison processing module.

1. A motor drive control apparatus, comprising:
 an electric machine; 
 a magnetic pole position computation processing module which computes a magnetic pole position of the electric machine; 
 a pattern generation processing module which generates a pulse pattern formed of a switching angle and an output level; 
 a switching angle computation processing module which computes a switching angle where switching is done in a next control period based on the pulse pattern; 
 a comparison processing module which compares the magnetic pole position with the computed switching angle to generate a comparison signal indicative of a comparison result; and 
 an on-off output processing module which generates a PWM signal based on the comparison signal. 
 
   
   
     2. The motor drive control apparatus according to  claim 1 , wherein the switching angle computation processing module has:
 a switching voltage phase angle prediction processing module which predicts a switching voltage phase angle where switching is done in the next control period; and 
 a switching magnetic pole position angle computation processing module which computes a switching magnetic pole position angle where switching is done in response to the switching voltage phase angle. 
 
   
   
     3. The motor drive control apparatus according to  claim 1 , wherein the magnetic pole position computation processing module is a phase counter. 
   
   
     4. The motor drive control apparatus according to  claim 1 , wherein the comparison processing module is a comparison match comparator. 
   
   
     5. A motor drive control method, comprising:
 computing a magnetic pole position of a electric machine; 
 generating a pulse pattern formed of a switching angle and an output level; 
 computing a switching angle where switching is done in a next control period based on the pulse pattern; 
 comparing the magnetic pole position with the computed switching angle to generate a comparison signal indicative of a comparison result; and 
 generating a PWM signal based on the comparison signal. 
 
   
   
     6. A program of a motor drive control method which allows a computer to function as:
 a magnetic pole position computation processing module which computes a magnetic pole position of a electric machine; 
 a pattern generation processing module which generates a pulse pattern formed of a switching angle and an output level; 
 a switching angle computation processing module which computes a switching angle where switching is done in a next control period based on the pulse pattern; 
 a comparison processing module which compares the magnetic pole position with the computed switching angle to generate a comparison signal indicative of a comparison result; and 
 an on-off output processing module which generates a PWM signal based on the comparison signal.